<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button class="exit" type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse?'64px':'200px'" style="transition:all .5s ease">
        <!-- <div :class="isCollapse?'toggle-button el-icon-arrow-left':'toggle-button el-icon-arrow-right'" @click="toggleCollapse"></div> -->
        <div :class="isCollapse?'toggle-button el-icon-arrow-right  menu-active':'toggle-button el-icon-arrow-right'" @click="toggleCollapse"></div>
        <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#fff"
          text-color="#000"
          active-text-color="#409FF0"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="item.icon"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
              <!-- 二级菜单 -->
              <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id"
               @click="saveNavState('/' + subItem.path)">
                <template slot="title">
                  <!-- 图标 -->
                  <i :class="subItem.icon"></i>
                  <!-- 文本 -->
                  <span>{{subItem.authName}}</span>
                </template>
              </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data () {
    return {
      // 左侧菜单数据
      menulist: [],
      // 由于这种操作属于图标强行写死，故不作操作
      // iconsObj: {
      //   125: 'iconfont icon-user',
      //   103: 'iconfont icon-tijikongjian',
      //   101: 'iconfont icon-shangpin',
      //   102: 'iconfont icon-danju',
      //   145: 'iconfont icon-baobiao'
      // },
      iconsObj: {},
      isCollapse: false,
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    // 退出登录
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList () {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error('$res.meta.msg')
      this.menulist = res.data
      console.log(res)
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = window.sessionStorage.getItem('activePath')
    }
  }
}
</script>

<style lang="less" scoped>

.exit {
  background-color: #F56C6C;
}
.exit:hover {
  background-color: #f59696;
}

.el-header {
  background-color: #fff;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #000;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
  }
  span {
    margin-left: 15px;
  }
}

.el-aside {
  background-color: #fff;
  .el-menu {
    border-right: 0;
}
}

.el-main {
  background-color: #eaedf1;
}

.home-container {
  height: 100%;
}

.toggle-button {
  width: 100%;
  background-color: #909399;
  line-height: 20px;
  color: #fff;
  text-align: center;
  cursor: pointer;
}

.menu-active {
  transform:rotate(180deg);
  transition:all .5s ease
}

</style>
